[llvm] [mlir] [mlir][spirv] Integrate `convert-to-spirv` into `mlir-vulkan-runner` (PR #106082)

[Jakub Kuderski via llvm-commits]

https://github.com/kuhar approved this pull request.

Thanks. Having to use a new flag is suboptimal, but overall this seems like a big improvement over using the gpu-to-spirv pass that accumulated unrelated patterns.

https://github.com/llvm/llvm-project/pull/106082